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Soft switch full-bridge phase-shift circuit with clamping circuit and its clamping method

A full-bridge phase-shifting and clamping circuit technology, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electrical variables, can solve problems such as reducing circuit reliability, and achieve improved reliability, high reliability, and versatility. Avoid the effect of shock

Inactive Publication Date: 2005-11-23
EMERSON NETWORK POWER CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in this scheme, the release process of excess energy is uncontrollable. It can only be determined by the characteristics of the circuit itself and the parameters of components. For example, the working state of the clamp diode is not necessarily optimal, which reduces the reliability of the circuit.

Method used

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  • Soft switch full-bridge phase-shift circuit with clamping circuit and its clamping method
  • Soft switch full-bridge phase-shift circuit with clamping circuit and its clamping method
  • Soft switch full-bridge phase-shift circuit with clamping circuit and its clamping method

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Embodiment Construction

[0029] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0030] A kind of novel phase-shifting full-bridge circuit that the present invention proposes sees figure 2 , it uses the clamp winding of the auxiliary inductance to realize the voltage clamping of the auxiliary inductance. While retaining the original soft switching characteristics, it can solve the problem caused by the reverse diode recovery, so it is called "soft switching with auxiliary inductance clamping Phase-shifted full-bridge circuit". This circuit also has its practical improved circuit, that is, a resistor Rc ( image 3 ). This method ensures that the excess energy of the auxiliary inductance is consumed in time in each switching cycle of the circuit, eliminates the influence caused by the recovery of the reverse diode, and improves the reliability of the circuit.

[0031] figure 2 The new type of auxiliary...

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Abstract

The redundant energy stored on resonant inductance is transferred to clamping winding through electromagnetic induction to avoid strong oscillation by the resonant inductance and parasitic parameter, and the energy releasing loop is formed by the clamping winding and a bridge arm on the full-bridge convertor to release said redundant energy after the reverse recovery period is finished. It ensures that the clamping diode can be worked in soft-switch state for raising the reliability of the circuit.

Description

Technical field: [0001] The invention relates to a soft-switching full-bridge phase-shifting circuit with a clamping circuit and a clamping method thereof. Background technique: [0002] The traditional phase-shifted full-bridge circuit ( figure 1 ) is a very excellent DC / DC converter, which uses the energy of the auxiliary inductance to realize the zero-voltage switching of the switching tube, which reduces the switching loss of the switching tube. The circuit has the advantages of simple control, easy soft switching of the switching tube, high circuit efficiency, and low EMI, and is known as one of the best DC / DC converters. However, due to the addition of auxiliary inductance, the diode will generate large voltage spikes and oscillations during the reverse recovery process of the secondary diode, which increases the switching loss of the diode and deteriorates the EMI of the circuit. If the diode withstand voltage is increased, the reverse recovery time of the diode wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCY02B70/1433Y02B70/1491Y02B70/10
Inventor 张华健吕明海王国泳黄伯宁
Owner EMERSON NETWORK POWER CO LTD
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